Create Ukm ReportingService implementation.

components/metrics/data_use_tracker_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/metrics/data_use_tracker.h"
 
 #include "base/strings/stringprintf.h"
 #include "components/metrics/metrics_pref_names.h"
 #include "components/prefs/pref_registry_simple.h"
 #include "components/prefs/testing_pref_service.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace metrics {
 
 namespace {
 
 const char kTodayStr[] = "2016-03-16";
 const char kYesterdayStr[] = "2016-03-15";
 const char kExpiredDateStr1[] = "2016-03-09";
 const char kExpiredDateStr2[] = "2016-03-01";
 
 class TestDataUsePrefService : public TestingPrefServiceSimple {
  public:
-  TestDataUsePrefService() {
-    registry()->RegisterDictionaryPref(metrics::prefs::kUserCellDataUse);
-    registry()->RegisterDictionaryPref(metrics::prefs::kUmaCellDataUse);
-  }
+  TestDataUsePrefService() { DataUseTracker::RegisterPrefs(registry()); }
 
   void ClearDataUsePrefs() {
     ClearPref(metrics::prefs::kUserCellDataUse);
     ClearPref(metrics::prefs::kUmaCellDataUse);
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestDataUsePrefService);
 };
 
@@ skipping 159 matching lines @@
   can_upload = data_use_tracker.ShouldUploadLogOnCellular(100);
   EXPECT_TRUE(can_upload);
   // this is about 0.49%
   can_upload = data_use_tracker.ShouldUploadLogOnCellular(200);
   EXPECT_TRUE(can_upload);
   can_upload = data_use_tracker.ShouldUploadLogOnCellular(300);
   EXPECT_FALSE(can_upload);
 }
 
 }  // namespace metrics